This guide shows how to set up two Reach RS2 units as a rover and a base and how to make them work over LoRa radio in RTK mode.
By default, every Reach RS2 has the same name, and the first thing you need to do is renaming them so it is easier to distinguish between the base and the rover in the field. To rename the units, follow the steps below:
Connect to Reach RS2 you want to use as a base.
HOW TO DEFINE REACH RS2?
There is an easy way to understand which unit you are connected to. Just open the menu and tap the lamp-shaped button—all LEDs will start to blink.
Go to Settings, tap General, and change the name to reach-base.
The name you enter will also be used as a Wi-Fi network label when Reach is in hotspot mode.
Use a special sticker from the package to mark the unit.
Do the same with the second Reach RS2. However, use reach-rover name instead of reach-base.
Now you need to configure RTK settings and communication over LoRa radio between the base and the rover. Let's start with the base, follow the steps below:
Connect to the base unit.
Go to Settings and tap GNSS settings. Pick each of the satellite systems.
Set the update rate at 1 Hz.
After that, go to Base mode.
Select to output RTCM3 messages as follows:
- ARP station coordinates at 0.1 Hz
- Other MSM4 messages at 0.5 Hz
Then go to Correction output and select LoRa.
Select frequency and set the output power at 20 dBm.
Make sure to select appropriate frequency and output power according to your local regulations. In case there are restrictions, frequency band limitations will be applied automatically.
Set air data rate at 9.11 kb/s and tap Save.
To complete configuring RTK settings and communication over LoRa radio between the base and the rover, you need to set up your rover. Follow the steps below:
Connect to the rover unit.
Go to Settings and tap GNSS settings.
Set the positioning mode to Kinematic.
Select the same GNSS systems as for the base, set 5 Hz update rate, and press Apply.
Now you need to configure LoRa radio on the rover unit to receive the corrections.
Go to Correction input and select LoRa.
Set the same frequency and air rate as for the base. Tap Save.
To make sure that corrections are passing from the base to the rover, you can put both receivers by the window for a few minutes to provide the sky visibility. After that, open ReachView 3, connect to the rover and go to the Status screen. Scroll down to the Corrections section and make sure that your rover is receiving corrections.
When you configured settings on both base and rover, you are ready to go outside to place the base and complete the setup process. For the field works, you will need a tripod and a survey pole. To place the units, follow the steps below:
Before placing the base, make sure that you are in an open area with a clear sky view. This will ensure good signal reception and a fair number of available satellites.
Mount Reach RS2 base.
Accurately level the tripod.
Put the rover on the pole.
Attach LoRa antennas to both units.
Turn on the receivers.
To learn more about placement, check the Placement guide.
After placing the base on the tripod, you can complete its setup:
Connect to the base.
Go to Settings and tap Base mode.
Configure base mode settings.
Select Average SINGLE as the base coordinates entry method and set averaging time. Press Save.
Do not move the base while Reach is accumulating data.
Base position is averaged automatically every time the receiver turns on.
After accumulating the data, you will see averaged coordinates in the Coordinates section. Now your base is set up and transmits corrections to the rover.
To learn more about methods of placing the base, check the Placing the base.
When you completed your RTK setup over LoRa radio, you can watch the current solution status in the top right corner of the ReachView 3 app:
SINGLE means that the rover has found a solution relying on its own receiver and base corrections are not applied. Precision in standalone mode is usually meter-level.
FLOAT means that the rover receives corrections from the base but cannot resolve all ambiguities, and in this case, the accuracy is usually at the submeter-level.
FIX means that the rover using corrections from the base resolved the ambiguities in its positional calculation and achieved the solution with centimeter-level accuracy.
After a short period of time, the rover gets a fixed solution. In good environments, it will take a few seconds to get a fixed solution. In tough conditions, it may take a little longer. Once rover gets FIX, you are all set for surveying.
You can also find the current solution status as well as your position in real time on the Status screen.